"Libraries of the United States and Canada: Oregon". American Library Annual, 1917-1918. New York: R.R. Bowker Co. 1918. p.399+ – via HathiTrust.
Cheryl Gunselman (Spring 2004), "Cornelia Marvin and Mary Frances Isom: Leaders of Oregon's Library Movement", Library Trends, 52
"Oregon's 150th: Libraries Then and Now"(PDF), Oregon Library Association Quarterly, 15 (3), Fall 2009 (special issue celebrating the 150 year history of Oregon libraries)
Institute for Museum and Library Services, "Library Search & Compare: Oregon", imls.gov, Washington, DC (data from the annual United States Public Libraries Survey)